package com.zjl.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.toolkit.IdWorker;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.zjl.mapper.OrderMapper;
import com.zjl.pojo.*;
import com.zjl.service.*;
import com.zjl.utils.BaseContext;
import com.zjl.utils.CustomException;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.math.BigDecimal;
import java.time.LocalDateTime;
import java.util.List;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.stream.Collectors;


@Service
public class OrderServiceImpl extends ServiceImpl<OrderMapper, Orders> implements OrderService {
    @Autowired
    private ShoppingCartService shoppingCartService;

    @Autowired
    private UserService userService;

    @Autowired
    private AddressBookService addressBookService;

    @Autowired
    private OrderDetailService orderDetailService;

    @Override
    @Transactional
    public void submit(Orders orders) {
        // 用户id
        Long userId = BaseContext.getCurrentId();
        // 查询用户购车信息
        LambdaQueryWrapper<ShoppingCart> wrapper = new LambdaQueryWrapper<>();
        wrapper.eq(ShoppingCart::getUserId, userId);
        List<ShoppingCart> shoppingCartList = shoppingCartService.list(wrapper);
        if(shoppingCartList.isEmpty()) {
            throw new CustomException("购物车为空，不能下单！");
        }
        // 查询用户信息
        User user = userService.getById(userId);
        // 查询用户地址
        AddressBook addressBook = addressBookService.getById(orders.getAddressBookId());
        if(addressBook == null) {
            throw new CustomException("用户地址信息有误，不能下单！");
        }

        //IdWorker是mybatis-plus提供的一个ID生成工具，可以生成一个全局唯一的长整形ID。
        long orderId = IdWorker.getId();//订单号

        //AtomicInteger是一个Java concurrent包提供的一个原子类，通过这个类可以对Integer进行一些原子操作。
        //原子整型数，保证线程安全
        AtomicInteger amount = new AtomicInteger(0);

        //组装订单明细信息
        List<OrderDetail> orderDetails = shoppingCartList.stream().map((item) -> {
            OrderDetail orderDetail = new OrderDetail();
            orderDetail.setOrderId(orderId);
            orderDetail.setNumber(item.getNumber());
            orderDetail.setDishFlavor(item.getDishFlavor());
            orderDetail.setDishId(item.getDishId());
            orderDetail.setSetMealId(item.getSetMealId());
            orderDetail.setName(item.getName());
            orderDetail.setImage(item.getImage());
            orderDetail.setAmount(item.getAmount());
            //这个是累加金额操作，累加每个菜品或者套餐乘于相应的份数
            amount.addAndGet(item.getAmount().multiply(new BigDecimal(item.getNumber())).intValue());
            return orderDetail;
        }).collect(Collectors.toList());

        //组装订单数据
        orders.setId(orderId);
        orders.setOrderTime(LocalDateTime.now());
        orders.setCheckoutTime(LocalDateTime.now());
        orders.setStatus(2);
        orders.setAmount(new BigDecimal(amount.get()));//总金额，math的API类BigDecimal，用来对超过16位有效位的数进行精确的运算。
        orders.setUserId(userId);
        //注意：orders里面的number是订单号的意思，不是数量
        orders.setNumber(String.valueOf(orderId));
        orders.setUserName(user.getName());
        orders.setConsignee(addressBook.getConsignee());
        orders.setPhone(addressBook.getPhone());
        orders.setAddress((addressBook.getProvinceName() == null ? "" : addressBook.getProvinceName())
                + (addressBook.getCityName() == null ? "" : addressBook.getCityName())
                + (addressBook.getDistrictName() == null ? "" : addressBook.getDistrictName())
                + (addressBook.getDetail() == null ? "" : addressBook.getDetail()));
        //向订单表插入数据，一条数据
        this.save(orders);

        //向订单明细表插入数据，多条数据
        orderDetailService.saveBatch(orderDetails);

        //清空购物车数据
        shoppingCartService.remove(wrapper);
    }
}
